Which retail innovation from the 1930s fundamentally transformed store layouts by allowing customers to select their own merchandise without clerk assistance for the first time?

The retail landscape has transformed dramatically throughout history, with technological innovations reshaping how we shop. From ancient marketplaces to digital storefronts, retail's evolution reflects broader societal and economic changes. This trivia question focuses on a pivotal moment in retail history that revolutionized store layouts and fundamentally changed the consumer experience in ways that continue to influence modern shopping patterns.

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Self-service grocery stores (like Piggly Wiggly)
Department store credit cards
Cash register with receipt printing capability
Automated inventory tracking systems